Hello, I want to modify my userchrome in firefox to hide the toolbar (the bar with the url), and i found a snippet which does that:

#nav-bar {
visibility: collapse;
{

but I want the toolbar to reappear when I bring my mouse near it, so that I can still use it. I don't want to go fullscreen because its annoying on a tiling wm and the transparency doesnt work in fullscreen on sway, but i want the toolbar to behave like it does in fullscreen basically.